Optimize DeserializedAnnotations in terms of memory traffic

Do not wrap every annotation object into an AnnotationWithTarget

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt

@@ -224,7 +224,7 @@ class MemberDeserializer(private val c: DeserializationContext) {
         }
         return DeserializedAnnotationsWithPossibleTargets(c.storageManager) {
             c.containingDeclaration.asProtoContainer()?.let {
-                c.components.annotationAndConstantLoader.loadCallableAnnotations(it, proto, kind)
+                c.components.annotationAndConstantLoader.loadCallableAnnotations(it, proto, kind).toList()
             }.orEmpty()
         }
     }
@@ -239,6 +239,7 @@ class MemberDeserializer(private val c: DeserializationContext) {
                 c.components.annotationAndConstantLoader
                         .loadExtensionReceiverParameterAnnotations(it, proto, receiverTargetedKind)
                         .map { AnnotationWithTarget(it, AnnotationUseSiteTarget.RECEIVER) }
+                        .toList()
             }.orEmpty()
         }
     }
@@ -255,7 +256,9 @@ class MemberDeserializer(private val c: DeserializationContext) {
             val flags = if (proto.hasFlags()) proto.flags else 0
             val annotations = if (containerOfCallable != null && Flags.HAS_ANNOTATIONS.get(flags)) {
                 DeserializedAnnotations(c.storageManager) {
-                    c.components.annotationAndConstantLoader.loadValueParameterAnnotations(containerOfCallable, callable, kind, i, proto)
+                    c.components.annotationAndConstantLoader
+                            .loadValueParameterAnnotations(containerOfCallable, callable, kind, i, proto)
+                            .toList()
                 }
             }
             else Annotations.EMPTY

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/TypeDeserializer.kt

@@ -85,9 +85,10 @@ class TypeDeserializer(
         }
 
         val annotations = DeserializedAnnotationsWithPossibleTargets(c.storageManager) {
-            c.components.annotationAndConstantLoader
-                    .loadTypeAnnotations(proto, c.nameResolver)
-                    .map { AnnotationWithTarget(it, null) } + additionalAnnotations.getAllAnnotations()
+            c.components.annotationAndConstantLoader.loadTypeAnnotations(proto, c.nameResolver)
+                    .map { AnnotationWithTarget(it, null) }
+                    .plus(additionalAnnotations.getAllAnnotations())
+                    .toList()
         }
 
         fun ProtoBuf.Type.collectAllArguments(): List<ProtoBuf.Type.Argument> =

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedAnnotations.kt

@@ -16,44 +16,55 @@
 
 package org.jetbrains.kotlin.serialization.deserialization.descriptors
 
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationWithTarget
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.descriptorUtil.annotationClass
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 import org.jetbrains.kotlin.storage.StorageManager
+import org.jetbrains.kotlin.storage.getValue
 
 class DeserializedAnnotations(
         storageManager: StorageManager,
         compute: () -> List<AnnotationDescriptor>
-) : DeserializedAnnotationsWithPossibleTargets(
-        storageManager,
-        { compute().map { AnnotationWithTarget(it, null) } })
-
-open class DeserializedAnnotationsWithPossibleTargets(
-        storageManager: StorageManager,
-        compute: () -> List<AnnotationWithTarget>
 ) : Annotations {
-    private val annotations = storageManager.createLazyValue { compute().toList() }
+    private val annotations by storageManager.createLazyValue(compute)
 
-    override fun isEmpty(): Boolean = annotations().isEmpty()
+    override fun isEmpty(): Boolean = annotations.isEmpty()
 
-    override fun findAnnotation(fqName: FqName) = annotations().firstOrNull {
-        annotationWithTarget ->
-        if (annotationWithTarget.target != null) return@firstOrNull false
-        val descriptor = annotationWithTarget.annotation.annotationClass
-        descriptor != null && fqName.toUnsafe() == DescriptorUtils.getFqName(descriptor)
-    }?.annotation
+    override fun findAnnotation(fqName: FqName) =
+            annotations.firstOrNull { annotation -> annotation.annotationClass?.fqNameUnsafe == fqName.toUnsafe() }
 
     override fun findExternalAnnotation(fqName: FqName) = null
 
-    override fun getUseSiteTargetedAnnotations() = annotations().filter { it.target != null }
+    override fun getUseSiteTargetedAnnotations(): List<AnnotationWithTarget> = emptyList()
 
-    override fun getAllAnnotations() = annotations()
+    override fun getAllAnnotations(): List<AnnotationWithTarget> = annotations.map { AnnotationWithTarget(it, null) }
+
+    override fun iterator(): Iterator<AnnotationDescriptor> = annotations.iterator()
+}
+
+class DeserializedAnnotationsWithPossibleTargets(
+        storageManager: StorageManager,
+        compute: () -> List<AnnotationWithTarget>
+) : Annotations {
+    private val annotations by storageManager.createLazyValue(compute)
+
+    override fun isEmpty(): Boolean = annotations.isEmpty()
+
+    override fun findAnnotation(fqName: FqName): AnnotationDescriptor? =
+            annotations.firstOrNull { (annotation, target) ->
+                target == null && annotation.annotationClass?.fqNameUnsafe == fqName.toUnsafe()
+            }?.annotation
+
+    override fun findExternalAnnotation(fqName: FqName) = null
+
+    override fun getUseSiteTargetedAnnotations(): List<AnnotationWithTarget> = annotations.filter { it.target != null }
+
+    override fun getAllAnnotations(): List<AnnotationWithTarget> = annotations
 
     override fun iterator(): Iterator<AnnotationDescriptor> {
-        return annotations().asSequence().filter { it.target == null }.map { it.annotation }.iterator()
+        return annotations.asSequence().filter { it.target == null }.map { it.annotation }.iterator()
     }
-}
+}

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt

@@ -81,7 +81,7 @@ class DeserializedClassDescriptor(
                 Annotations.EMPTY
             }
             else DeserializedAnnotations(c.storageManager) {
-                c.components.annotationAndConstantLoader.loadClassAnnotations(thisAsProtoContainer)
+                c.components.annotationAndConstantLoader.loadClassAnnotations(thisAsProtoContainer).toList()
             }
 
     override fun getContainingDeclaration(): DeclarationDescriptor = containingDeclaration
@@ -309,7 +309,7 @@ class DeserializedClassDescriptor(
                 EnumEntrySyntheticClassDescriptor.create(
                         c.storageManager, this@DeserializedClassDescriptor, name, enumMemberNames,
                         DeserializedAnnotations(c.storageManager) {
-                            c.components.annotationAndConstantLoader.loadEnumEntryAnnotations(thisAsProtoContainer, proto)
+                            c.components.annotationAndConstantLoader.loadEnumEntryAnnotations(thisAsProtoContainer, proto).toList()
                         },
                         SourceElement.NO_SOURCE
                 )

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedTypeParameterDescriptor.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.serialization.deserialization.descriptors
 
 import org.jetbrains.kotlin.descriptors.SourceElement
 import org.jetbrains.kotlin.descriptors.SupertypeLoopChecker
-import org.jetbrains.kotlin.descriptors.annotations.AnnotationWithTarget
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.impl.AbstractLazyTypeParameterDescriptor
 import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
@@ -36,10 +35,8 @@ class DeserializedTypeParameterDescriptor(
         c.storageManager, c.containingDeclaration, c.nameResolver.getName(proto.name),
         Deserialization.variance(proto.variance), proto.reified, index, SourceElement.NO_SOURCE, SupertypeLoopChecker.EMPTY
 ) {
-    override val annotations = DeserializedAnnotationsWithPossibleTargets(c.storageManager) {
-        c.components.annotationAndConstantLoader
-                .loadTypeParameterAnnotations(proto, c.nameResolver)
-                .map { AnnotationWithTarget(it, null) }
+    override val annotations = DeserializedAnnotations(c.storageManager) {
+        c.components.annotationAndConstantLoader.loadTypeParameterAnnotations(proto, c.nameResolver).toList()
     }
 
     override fun resolveUpperBounds(): List<KotlinType> {